Support pillow



FIG. 1 is a top plan view of a support pillow showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation thereof;

FIG. 5 is a left elevation view thereof; and,

FIG. 6 is a right side isometric view thereof. 

The ornamental design for a support pillow, as shown and described. 